I think it is pretty likely that Supastox will be allowed next season (2013). You can still race this year but points don't count.
The Mardave class rules are really simple. Battery limit is 2S LiPo, 6 cell NiMh or lower. Motor and ESC are unlimited (in reality speed peaks at about 13T due to gearing limitations). You aren't allowed to run any components that make the car into a 1/12 circuit car (pan car). This means no sports prototype bodies or super wide tyres, only stock design suspension components etc. Pretty straightforward.
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